#include <string>
#include "pbd/cartesian.h"
+#include "pbd/compose.h"
-#include "ardour/pannable.h"
-#include "ardour/speakers.h"
+#include "ardour/amp.h"
#include "ardour/audio_buffer.h"
#include "ardour/buffer_set.h"
#include "ardour/pan_controllable.h"
+#include "ardour/pannable.h"
+#include "ardour/speakers.h"
#include "vbap.h"
#include "vbap_speakers.h"
+#include "i18n.h"
+
using namespace PBD;
using namespace ARDOUR;
using namespace std;
extern "C" { PanPluginDescriptor* panner_descriptor () { return &_descriptor; } }
-VBAPanner::Signal::Signal (Session& session, VBAPanner& p, uint32_t n)
+VBAPanner::Signal::Signal (Session& session, VBAPanner& p, uint32_t n, uint32_t n_speakers)
{
- gains[0] = gains[1] = gains[2] = 0;
+ resize_gains (n_speakers);
+
desired_gains[0] = desired_gains[1] = desired_gains[2] = 0;
outputs[0] = outputs[1] = outputs[2] = -1;
desired_outputs[0] = desired_outputs[1] = desired_outputs[2] = -1;
-};
+}
+
+void
+VBAPanner::Signal::Signal::resize_gains (uint32_t n)
+{
+ gains.assign (n, 0.0);
+}
VBAPanner::VBAPanner (boost::shared_ptr<Pannable> p, boost::shared_ptr<Speakers> s)
: Panner (p)
clear_signals ();
for (uint32_t i = 0; i < n; ++i) {
- _signals.push_back (new Signal (_pannable->session(), *this, i));
+ Signal* s = new Signal (_pannable->session(), *this, i, _speakers->n_speakers());
+ _signals.push_back (s);
+
}
update ();
void
VBAPanner::update ()
{
- /* recompute signal directions based on panner azimuth and width (diffusion) parameters)
+ /* recompute signal directions based on panner azimuth and, if relevant, width (diffusion) parameters)
*/
/* panner azimuth control is [0 .. 1.0] which we interpret as [0 .. 360] degrees
*/
-
double center = _pannable->pan_azimuth_control->get_value() * 360.0;
- /* panner width control is [-1.0 .. 1.0]; we ignore sign, and map to [0 .. 360] degrees
- so that a width of 1 corresponds to a signal equally present from all directions,
- and a width of zero corresponds to a point source from the "center" (above)
- */
+ if (_signals.size() > 1) {
+
+ /* panner width control is [-1.0 .. 1.0]; we ignore sign, and map to [0 .. 360] degrees
+ so that a width of 1 corresponds to a signal equally present from all directions,
+ and a width of zero corresponds to a point source from the "center" (above) point
+ on the perimeter of the speaker array.
+ */
+
+ double w = fabs (_pannable->pan_width_control->get_value()) * 360.0;
+
+ double min_dir = center - (w/2.0);
+ if (min_dir < 0) {
+ min_dir = 360.0 + min_dir; // its already negative
+ }
+ min_dir = max (min (min_dir, 360.0), 0.0);
+
+ double max_dir = center + (w/2.0);
+ if (max_dir > 360.0) {
+ max_dir = max_dir - 360.0;
+ }
+ max_dir = max (min (max_dir, 360.0), 0.0);
+
+ if (max_dir < min_dir) {
+ swap (max_dir, min_dir);
+ }
- double w = fabs (_pannable->pan_width_control->get_value()) * 360.0;
+ double degree_step_per_signal = (max_dir - min_dir) / (_signals.size() - 1);
+ double signal_direction = min_dir;
- double min_dir = center - w;
- min_dir = max (min (min_dir, 360.0), 0.0);
+ if (w >= 0.0) {
- double max_dir = center + w;
- max_dir = max (min (max_dir, 360.0), 0.0);
+ /* positive width - normal order of signal spread */
- double degree_step_per_signal = (max_dir - min_dir) / _signals.size();
- double signal_direction = min_dir;
+ for (vector<Signal*>::iterator s = _signals.begin(); s != _signals.end(); ++s) {
+
+ Signal* signal = *s;
+
+ signal->direction = AngularVector (signal_direction, 0.0);
+ compute_gains (signal->desired_gains, signal->desired_outputs, signal->direction.azi, signal->direction.ele);
+ signal_direction += degree_step_per_signal;
+ }
+ } else {
- for (vector<Signal*>::iterator s = _signals.begin(); s != _signals.end(); ++s) {
+ /* inverted width - reverse order of signal spread */
- Signal* signal = *s;
+ for (vector<Signal*>::reverse_iterator s = _signals.rbegin(); s != _signals.rend(); ++s) {
+
+ Signal* signal = *s;
+
+ signal->direction = AngularVector (signal_direction, 0.0);
+ compute_gains (signal->desired_gains, signal->desired_outputs, signal->direction.azi, signal->direction.ele);
+ signal_direction += degree_step_per_signal;
+ }
+ }
- signal->direction = AngularVector (signal_direction, 0.0);
+ } else if (_signals.size() == 1) {
- compute_gains (signal->desired_gains, signal->desired_outputs, signal->direction.azi, signal->direction.ele);
- cerr << " @ " << signal->direction.azi << " /= " << signal->direction.ele
- << " Outputs: "
- << signal->desired_outputs[0] + 1 << ' '
- << signal->desired_outputs[1] + 1 << ' '
- << " Gains "
- << signal->desired_gains[0] << ' '
- << signal->desired_gains[1] << ' '
- << endl;
+ /* width has no role to play if there is only 1 signal: VBAP does not do "diffusion" of a single channel */
- signal_direction += degree_step_per_signal;
+ Signal* s = _signals.front();
+ s->direction = AngularVector (center, 0);
+ compute_gains (s->desired_gains, s->desired_outputs, s->direction.azi, s->direction.ele);
}
}
double small_g;
double big_sm_g, gtmp[3];
- azi_ele_to_cart (azi,ele, cartdir[0], cartdir[1], cartdir[2]);
+ spherical_to_cartesian (azi, ele, 1.0, cartdir[0], cartdir[1], cartdir[2]);
big_sm_g = -100000.0;
gains[0] = gains[1] = gains[2] = 0;
speaker_ids[0] = _speakers->speaker_for_tuple (i, 0);
speaker_ids[1] = _speakers->speaker_for_tuple (i, 1);
-
+
if (_speakers->dimension() == 3) {
gains[2] = gtmp[2];
speaker_ids[2] = _speakers->speaker_for_tuple (i, 2);
distribute_one (inbufs.get_audio (n), obufs, gain_coefficient, nframes, n);
- memcpy (signal->gains, signal->desired_gains, sizeof (signal->gains));
memcpy (signal->outputs, signal->desired_outputs, sizeof (signal->outputs));
}
}
VBAPanner::distribute_one (AudioBuffer& srcbuf, BufferSet& obufs, gain_t gain_coefficient, pframes_t nframes, uint32_t which)
{
Sample* const src = srcbuf.data();
- Sample* dst;
- pan_t pan;
- uint32_t n_audio = obufs.count().n_audio();
- bool todo[n_audio];
Signal* signal (_signals[which]);
- for (uint32_t o = 0; o < n_audio; ++o) {
- todo[o] = true;
- }
-
/* VBAP may distribute the signal across up to 3 speakers depending on
the configuration of the speakers.
+
+ But the set of speakers in use "this time" may be different from
+ the set of speakers "the last time". So we have up to 6 speakers
+ involved, and we have to interpolate so that those no longer
+ in use are rapidly faded to silence and those newly in use
+ are rapidly faded to their correct level. This prevents clicks
+ as we change the set of speakers used to put the signal in
+ a given position.
+
+ However, the speakers are represented by output buffers, and other
+ speakers may write to the same buffers, so we cannot use
+ anything here that will simply assign new (sample) values
+ to the output buffers - everything must be done via mixing
+ functions and not assignment/copying.
*/
+ vector<double>::size_type sz = signal->gains.size();
+
+ assert (sz == obufs.count().n_audio());
+
+ int8_t outputs[sz]; // on the stack, no malloc
+
+ /* set initial state of each output "record"
+ */
+
+ for (uint32_t o = 0; o < sz; ++o) {
+ outputs[o] = 0;
+ }
+
+ /* for all outputs used this time and last time,
+ change the output record to show what has
+ happened.
+ */
+
+
+ for (int o = 0; o < 3; ++o) {
+ if (signal->outputs[o] != -1) {
+ /* used last time */
+ outputs[signal->outputs[o]] |= 1;
+ }
+
+ if (signal->desired_outputs[o] != -1) {
+ /* used this time */
+ outputs[signal->desired_outputs[o]] |= 1<<1;
+ }
+ }
+
+ /* at this point, we can test a speaker's status:
+
+ (outputs[o] & 1) <= in use before
+ (outputs[o] & 2) <= in use this time
+ (outputs[o] & 3) == 3 <= in use both times
+ outputs[o] == 0 <= not in use either time
+
+ */
+
for (int o = 0; o < 3; ++o) {
- if (signal->desired_outputs[o] != -1) {
-
- pframes_t n = 0;
+ pan_t pan;
+ int output = signal->desired_outputs[o];
- /* XXX TODO: interpolate across changes in gain and/or outputs
- */
+ if (output == -1) {
+ continue;
+ }
- dst = obufs.get_audio (signal->desired_outputs[o]).data();
+ pan = gain_coefficient * signal->desired_gains[o];
- pan = gain_coefficient * signal->desired_gains[o];
- mix_buffers_with_gain (dst+n,src+n,nframes-n,pan);
+ if (pan == 0.0 && signal->gains[output] == 0.0) {
+
+ /* nothing deing delivered to this output */
- todo[o] = false;
- }
- }
-
- for (uint32_t o = 0; o < n_audio; ++o) {
- if (todo[o]) {
- /* VBAP decided not to deliver any audio to this output, so we write silence */
- dst = obufs.get_audio(o).data();
- memset (dst, 0, sizeof (Sample) * nframes);
- }
+ signal->gains[output] = 0.0;
+
+ } else if (fabs (pan - signal->gains[output]) > 0.00001) {
+
+ /* signal to this output but the gain coefficient has changed, so
+ interpolate between them.
+ */
+
+ AudioBuffer& buf (obufs.get_audio (output));
+ buf.accumulate_with_ramped_gain_from (srcbuf.data(), nframes, signal->gains[output], pan, 0);
+ signal->gains[output] = pan;
+
+ } else {
+
+ /* signal to this output, same gain as before so just copy with gain
+ */
+
+ mix_buffers_with_gain (obufs.get_audio (output).data(),src,nframes,pan);
+ signal->gains[output] = pan;
+ }
}
-
+
+ /* clean up the outputs that were used last time but not this time
+ */
+
+ for (uint32_t o = 0; o < sz; ++o) {
+ if (outputs[o] == 1) {
+ /* take signal and deliver with a rapid fade out
+ */
+ AudioBuffer& buf (obufs.get_audio (o));
+ buf.accumulate_with_ramped_gain_from (srcbuf.data(), nframes, signal->gains[o], 0.0, 0);
+ signal->gains[o] = 0.0;
+ }
+ }
+
+ /* note that the output buffers were all silenced at some point
+ so anything we didn't write to with this signal (or any others)
+ is just as it should be.
+ */
}
void
{
set<Evoral::Parameter> s;
s.insert (Evoral::Parameter (PanAzimuthAutomation));
- s.insert (Evoral::Parameter (PanWidthAutomation));
+ if (_signals.size() > 1) {
+ s.insert (Evoral::Parameter (PanWidthAutomation));
+ }
return s;
}
switch (ac->parameter().type()) {
case PanAzimuthAutomation: /* direction */
- return string_compose (_("%1"), val * 360.0);
+ return string_compose (_("%1"), int (rint (val * 360.0)));
case PanWidthAutomation: /* diffusion */
return string_compose (_("%1%%"), (int) floor (100.0 * fabs(val)));
{
return _speakers->parent();
}
+
+void
+VBAPanner::set_position (double p)
+{
+ if (p < 0.0) {
+ p = 1.0 + p;
+ }
+
+ if (p > 1.0) {
+ p = fmod (p, 1.0);
+ }
+
+ _pannable->pan_azimuth_control->set_value (p);
+}
+
+void
+VBAPanner::set_width (double w)
+{
+ _pannable->pan_width_control->set_value (min (1.0, max (-1.0, w)));
+}
projects / ardour.git / blobdiff